[JAVA][Beginning Java 8 Games Development]

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Chapter 15 ■ Implementing Game Audio Assets: Using the JavaFX AudioClip Class Audio Sequencing Engine Figure 15-20. Add conditional if() statements to the .playAudioClip() method that call the correct .playiSound() method Now we have added digital audio to our game engine infrastructure, and all we have to do later is swap out the voiceovers with sound effects, and we will have the digital audio portion of our game development completed. If you use a Run ➤ Project work process and test the code, you will find that audio samples trigger rapidly using JavaFX. Summary In this fifteenth chapter, we changed our focus from how our game looks to our eyes (visual) and addressed how it sounds to our ears (aural), and took a chapter to implement the code for the AudioClip class so that we can trigger digital audio sound effects. First we took a look at the JavaFX AudioClip class. We learned why it is perfectly suited for use in our game development for audio, including short musical loops (using the INDEFINITE constant setting) or rapid sound effects. Next, we learned how to optimize digital audio assets using Audacity 2.0.6. We learned the work process for optimizing digital audio so that it takes only a dozen or so kilobytes of system memory, and how to optimize audio so well that we do not even have to apply compression, especially since audio compression codecs supported by Java 8 are “lossy” codecs and can degrade the quality of the audio data once they are decompressed into system memory. Finally, we implemented AudioClip objects in our InvinciBagel.java class using a .loadAudioAssets() method, and then created six .playiSound() methods to allow external classes to access and play these digital audio assets. We also added a .playAudioClip() method in our Bagel.java class that triggered the audio samples based on which keys were being pressed. In the next chapter, we are going take a look at how to add collision detection to our game code. www.it-ebooks.info 341
Chapter 16 Collision Detection: Creating SVG Polygons for the Game Actors and Writing Code to Detect Collision Now that we have implemented digital audio for our game sound effects and short-loop music, as well as implemented our digital imaging related classes that create motion sprites (characters) and fixed sprites (props), we will now delve into the other major genre or area of new media: vectors. Vectors are utilized in 2D illustration software (InkScape) as well as 3D modeling and animation software (Blender), and use math to define the shapes that are used to create the 2D or 3D artwork. This makes vectors the perfect solution for defining custom collision shapes that perfectly encase our sprites, so that instead of using a complex array of pixels to detect collision, we use a far simpler (and far more memory and processor efficient) collision polygon, that will perfectly surround our sprite. Fortunately for us, the JavaFX SVGPath class in the javafx.scene.shape package allows us to use custom SVG Path (Shape) data to define our sprite collision boundaries. Not only that, but this SVGPath class (object) is also highly efficient, as it has zero properties, only a few methods, and a simple SVGPath() constructor method, as you have seen already in Chapter 8. This means that using the SVGPath class (object) is relatively memory and processor efficient. In fact, the only method that we will need to use is the .setContent() method that we used in our Actor class constructor method in Chapter 8. Since we’ll do this once, at game start-up, the SVG Path collision data will be loaded into system memory and will be used in our collision detection routines, which we will be putting into place later in this chapter. In this chapter we’ll take a detailed look at how the SVG Path data can be defined. This is specified by World Wide Web (W3) Consortium (also known as W3C), the body who defines HTML5. This specification is on their w3.org website, and is located at the http://www.w3.org/TR/SVG/paths.html URL, if you want to view it in further detail. After we look at the SVG or Scalable Vector Graphics (in case you are wondering what this stands for) data format in detail, we will get into using the popular GIMP 2.8 digital image editing software, which you installed in Chapter 1, and learn how to create collision polygons. We will also take a look at how to use the PhysEd (PhysicsEditor) collision polygon generation software. This is from a company called CodeAndWeb GmbH, who makes professional, and affordable, game assets creation software. We will go through a collision polygon vector asset creation and optimization process using GIMP 2.8, using both the quick and dirty work process, which allows GIMP to 100% create the collision polygon shape for you, as well as a more “involved” work process, where you create your own collision polygon yourself, by hand, using GIMP’s Path tools. After we have learned how to create collision polygons that are compatible with the JavaFX SVGPath class, we will spend the remainder of the chapter on Java 8 game programming, creating the collision detection engine (code) that will allow us to detect when our InvinciBagel character comes into contact with any of the other Actor objects in the game environment (Scene and Stage objects). This is where the book will start to become more advanced (useful). 343
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Contents at a Glance About the Auth
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Introduction The Java Programming L
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■ Introduction In Chapter 13 you
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Chapter 1 ■ Setting Up a Java 8 G
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Chapter 2 Setting Up Your Java 8 ID
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Chapter 2 ■ Setting Up Your Java
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Profiling Your Java 8 Game Applicat
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Chapter 3 ■ A Java 8 Primer: An I
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Chapter 4 ■ An Introduction to Ja
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Chapter 5 An Introduction to Game D
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Chapter 6 The Foundation of Game De
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Chapter 6 ■ The Foundation of Gam
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Chapter 7 The Foundation of Game Pl
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Chapter 8 Creating Your Actor Engin
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Chapter 8 ■ Creating Your Actor E
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Chapter 9 Controlling Your Action F
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Chapter 9 ■ Controlling Your Acti
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Chapter 10 Directing the Cast of Ac
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Chapter 10 ■ Directing the Cast o
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Chapter 11 ■ Moving Your Action F
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Chapter 12 Setting Boundaries for Y
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Chapter 13 ■ Animating Your Actio
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Chapter 17 Enhancing Game Play: Cre
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Chapter 17 ■ Enhancing Game Play:
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■ index Background image (cont.)
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■ index InvinciBagel animation (c
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■ index Modifier keywords access
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Beginning Java 8 Games Development
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This Java 8 Game Development book i
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■ Contents NetBeans 8.0 Is User I
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■ Contents ■■Chapter 5: An In
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■ Contents Creating a Hero Superc
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■ Contents Organizing the .update
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■ Contents Optimizing the Scene G
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About the Author Wallace Jackson ha
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Acknowledgments I would like to ack
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